The normal verbiage used is average and you are correct (I think) in pointing out that if a BEV is to be your only vehicle you might want to look at average plus 2 standard deviations which would cover 95% of your travels and leave only 5% needing to use public transit or a rental vehicle. In my case I have a second vehicle and so use that for extended trips and can live with the average plus 1 standard deviation as my range goals.
Lawrence > On May 13, 2015, at 12:44 PM, Jamie K via EV <ev@lists.evdl.org> wrote: > > > The assumption of what "nearly everyone needs in a day" is based on averages, > right? > > Averages are built from data ranging from minimums to maximums. But real > range needs are based on maximums. So it would be erroneous to assume that > averages define the actual range needs of most people. > > Further, it matters how often people need to hop in the car and run an > errand, handle an emergency or drive to the next town. Faster L2 charging > frees up the car for more trips in a day, and L3 opens the portal to nearby > intercity trips. Supercharging opens the portal to interstate trips. All of > these charging options make an EV that much more practical. > > For the Volt there's a 300 mile generator included, so it's OK to design for > "most trips." But for a BEV, the driver must consider the maximum trip > required or have another vehicle to pick up that slack. > > Cheers, > -Jamie > > > On 5/13/15 1:08 PM, Ben Goren wrote: >> On May 13, 2015, at 11:51 AM, Jamie K via EV <ev@lists.evdl.org> wrote: >> >>> Ben, on the subject of L1 chargers being good enough for nearly everybody >>> and L2 being overkill, I would ask "based on what data"? >> >> Sorry...I had in mind overnight home charging, with the assumption that the >> 20 kWh you get from 12 hours @ 110V / 15A is going to be good enough for as >> many miles as nearly everybody is going to need in a day, especially given >> the types of efficiency figures we're headed towards and that Lawrence was >> advocating. At 250 Wh / mile, that's 80 miles. Even at 500 Wh / mile, that's >> still 40 miles, the range that Chevy targeted for the Volt as "almost good >> enough for 100% electric for almost everybody." >> >> Yes, there will be exceptions...but how many people regularly drive more >> than 40 miles in a day, and, of those, how many are going to want to do so >> in an EV that's only doing 500 Wh / mile? >> >> Even more important...how many people are going to want to spend lots of >> extra money on an at-home fast charger if overnight L1 charging always >> leaves them with 80 miles more in the morning than they had at the end of >> the day before? >> >> b& >> > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
